Question

a Gardner want to fence a circular garden of diameter 21 m find the length of the Rope he needs to purchase if he makes two rounds of fence also find the cost of the Rope if it cost RS 4 per metre take π is equal to 22 / 7

Answer 1

The length of the rope is 132 m and its overall cost of fencing is Rs 528.

Answer 2

Step-by-step explanation:

$\fbox \pink{diameter} = 21m \\ \\ \fbox \purple{radius} = \frac{21}{2}m \\ \\ \fbox \red{circumference} = 2\pi \: r \\ \\ 2 \times \frac{22}{7} \times \frac{21}{2} = \frac{22}{7} \times 21 \\ \\ 22 \times 3 = 66m \\ \\ \fbox \green{length \: of \: rope \: required} = 2 \times 66 = 132m \\ \\ \fbox \blue{cost} = 1m \: rope = 4 \\ \\ 132m \: rope = 4 \times 132 = 528$